Wafer level chip scale package and method of manufacturing the same

ABSTRACT

A semiconductor structure includes a die including a top surface and a sidewall, and a molding surrounding the die and including a top surface, a sidewall interfacing with the sidewall of the die, and a curved surface including a curvature greater than zero and coupling the sidewall of the molding with the top surface of the molding.

BACKGROUND

Electronic equipment using semiconductor device are essential for many modern applications. With the advancement of electronic technology, electronic equipment is becoming increasingly smaller in size while having greater functionality and greater amounts of integrated circuitry. Thus, manufacturing of the electronic equipment includes more and more steps of assembly and involves various materials for producing the semiconductor device in the electronic equipment. Therefore, there is a continuous demand on simplifying the steps of production, increasing a production efficiency and lowering an associated manufacturing cost on each electronic equipment.

The major trend in the electronic industry is to make the semiconductor device smaller and more multifunctional. The semiconductor device comprises numbers of components overlaying on each other and several electrical interconnection structures for electrically connecting the components between adjacent layers, such that the final size of the semiconductor device as well as the electronic equipment is minimized. However, as different layers and components include different kinds of materials with different thermal properties, the semiconductor device in such configuration would have delamination and bondability issues. The poor bondability between components would lead to delamination of components and yield loss of the semiconductor device. Furthermore, the components of the semiconductor device includes various metallic materials which are in limited quantity and thus in a high cost. The yield loss of the semiconductor would further exacerbate materials wastage and thus the manufacturing cost would increase.

Numerous manufacturing operations are implemented within such a small and high performance semiconductor device. Thus, manufacturing the semiconductor device in a miniaturized scale becomes more complicated. An increase in a complexity of manufacturing the semiconductor device may cause deficiencies such as poor reliability of the electrical interconnection, development of cracks within components and delamination of layers. Thus, there is a continuous need to improve the method for manufacturing the semiconductor device in order to solve the above deficiencies.

BRIEF DESCRIPTION OF THE DRAWINGS

Aspects of the present disclosure are best understood from the following detailed description when read with the accompanying figures. It is noted that, in accordance with the standard practice in the industry, various features are not drawn to scale. In fact, the dimensions of the various features may be arbitrarily increased or reduced for clarity of discussion.

FIG. 1 is a schematic view of a semiconductor structure with a curved surface of a molding surrounding a die in accordance with some embodiments.

FIG. 2 is a schematic view of a semiconductor structure with two dies surrounded by a curved surface of a molding in accordance with some embodiments.

FIG. 3 is a schematic view of a semiconductor structure with a die surrounding by a molding surrounding a die in accordance with some embodiments.

FIG. 4 is a schematic view of a semiconductor structure with two dies surrounded by a molding surrounding a die in accordance with some embodiments.

FIG. 5 is a schematic view of a semiconductor structure with two dies in different height in accordance with some embodiments.

FIG. 6 is a schematic view of a semiconductor structure with a polymer and vias adjacent to a curved surface of a molding in accordance with some embodiments.

FIG. 7 is a schematic view of a semiconductor structure with a polymer and a via disposed over a die in accordance with some embodiments.

FIG. 8 is a flow diagram of a method of manufacturing a semiconductor structure in accordance with some embodiments.

FIG. 8A is a schematic view of a die with a sacrificial layer in accordance with some embodiments.

FIG. 8B is a schematic view of a die disposed on a substrate in accordance with some embodiments.

FIG. 8C is a schematic view of a die surrounded by a molding in accordance with some embodiments.

FIG. 8D is a schematic view of a ground molding and a ground sacrificial layer in accordance with some embodiments.

FIG. 8E is a schematic view of a curved surface of a molding in accordance with some embodiments.

FIG. 8F is a schematic view of a die without a sacrificial layer in accordance with some embodiments.

FIG. 8G is a schematic view of a polymer disposed over a die in accordance with some embodiments.

FIG. 8H is a schematic view of a via passed through a polymer in accordance with some embodiments.

FIG. 8I is a schematic view of a redistribution layer (RDL) disposed over a die in accordance with some embodiments.

FIG. 8J is a schematic view of a conductive bump disposed on a bond pad in accordance with some embodiments.

FIG. 8K is a schematic view of a pad of another substrate bonded with a conductive bump in accordance with some embodiments.

FIG. 9 is a flow diagram of a method of manufacturing a semiconductor structure in accordance with some embodiments.

FIG. 9A is a schematic view of a first die and a second die in accordance with some embodiments.

FIG. 9B is a schematic view of a first die and a second die disposed on a substrate in accordance with some embodiments.

FIG. 9C is a schematic view of a first die and a second die surrounded by a molding in accordance with some embodiments.

FIG. 9D is a schematic view of a ground molding and a ground sacrificial layer in accordance with some embodiments.

FIG. 9E is a schematic view of a top surface and a curved surface of a molding in accordance with some embodiments.

FIG. 9F is a schematic view of a first die and a second die without a sacrificial layer in accordance with some embodiments.

FIG. 9G is a schematic view of a polymer disposed over a first die and a second die in accordance with some embodiments.

FIG. 9H is a schematic view of a first via and a second via passed through a polymer in accordance with some embodiments.

FIG. 9I is a schematic view of a redistribution layer (RDL) disposed over a first die and a second die in accordance with some embodiments.

FIG. 9J is a schematic view of conductive bumps disposed on bond pads in accordance with some embodiments.

FIG. 9K is a schematic view of pads of another substrate bonded with conductive bumps in accordance with some embodiments.

DETAILED DESCRIPTION OF THE DISCLOSURE

The following disclosure provides many different embodiments, or examples, for implementing different features of the provided subject matter. Specific examples of components and arrangements are described below to simplify the present disclosure. These are, of course, merely examples and are not intended to be limiting. For example, the formation of a first feature over or on a second feature in the description that follows may include embodiments in which the first and second features are formed in direct contact, and may also include embodiments in which additional features may be formed between the first and second features, such that the first and second features may not be in direct contact. In addition, the present disclosure may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed.

Further, spatially relative terms, such as “beneath,” “below,” “lower,” “above,” “upper” and the like, may be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. The spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. The apparatus may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein may likewise be interpreted accordingly.

A semiconductor device is manufactured by a number of operations. During the manufacturing, a top surface of a die including several circuits and components is covered by a sacrificial layer, and the die is encapsulated by a molding. As such, the die is protected by the molding and the circuits exposed from the top surface of the die are protected by the sacrificial layer. The sacrificial layer prevents the circuits of the die from damages during grinding of a top surface of the molding. After the grinding of the molding, the sacrificial layer would be removed.

After removing the sacrificial layer from the top surface of the die, there is a stepped portion of the molding adjacent to a periphery of the die. The stepped portion would cause other components subsequently placed over the top surface of the die could not be smoothly disposed thereon, and thus delamination of components is suffered. The formation of the stepped portion of the molding compound leads to a stepping between components and thus induce a poor bondability between components and a poor reliability of the semiconductor device.

In the present disclosure, a semiconductor structure with a structural improvement is disclosed. The semiconductor structure includes a molding with a curved surface adjacent to a periphery of a die. The curved surface is coupled with a top surface of the molding and a sidewall of the molding. As such, the curved surface of the molding smoothen a height difference between the top surface of the molding and a top surface of the die. Thus, a stepping of the molding adjacent to the periphery of the die is mitigated by the curved surface. Therefore, delamination of components is prevented and a reliability of the semiconductor device is improved.

Furthermore, a molding without a stepped portion is also disclosed. A semiconductor structure includes the molding without the stepped portion disposed adjacent to a top surface of a die. The stepped portion is removed by an etching operation, so that the top surface of the die is at a substantially same level as a top surface of the molding. As there is no substantial stepping between the molding and the die, the components subsequently configured over the die and the molding are smoothly disposed. Therefore, a bondability between components is improved and delamination of components is avoided.

FIG. 1 is a semiconductor structure 100 in accordance with various embodiments of the present disclosure. The semiconductor structure 100 includes a die 101. In some embodiments, the die 101 is a small piece including semiconductor materials such as silicon and is fabricated with a predetermined functional circuit within the die 101 produced by photolithography operations. In some embodiments, the die 101 is singulated from a silicon wafer by a mechanical or laser blade. In some embodiments, the die 101 is in a quadrilateral, a rectangular or a square shape.

In some embodiments, the die 101 includes a top surface 101 a, a sidewall 101 b and a bottom surface 101 c. In some embodiments, the top surface 101 a of the die 101 is substantially orthogonal to the sidewall 101 b of the die 101. In some embodiments, the top surface 101 a is a horizontal plane and the sidewall 101 b is a vertical plane.

In some embodiments, the die 101 includes a die pad 101 d exposed from the top surface 101 a of the die 101. In some embodiments, the die pad 101 d is configured for electrically connecting with a circuitry external to the die 101, so that a circuitry internal to the die 101 electrically connects with the circuitry external to the die 101 through the die pad 101 d.

In some embodiments, the die pad 101 d is configured for electrically coupling with a conductive bump through a redistribution layer (RDL) disposed over the die pad 101 d, so that the circuitry internal to the die 101 connects with the circuitry external to the die 101 from the die pad 101 d to the conductive bump through the RDL. In some embodiments, the die pad 101 d includes gold, silver, copper, nickel, tungsten, aluminum, palladium and/or alloys thereof. In some embodiments, the conductive bump is a solder ball or solder paste.

In some embodiments, the semiconductor structure 100 includes a substrate 102. In some embodiments, the die 101 is disposed on the substrate 102 for subsequent manufacturing operations. In some embodiments, the bottom surface 101 c of the die 101 is attached on a surface 102 a of the substrate 102 by an adhesive, a tape or die attach film (DAF) 102 b etc. In some embodiments, the substrate 102 includes glass, silicon or ceramic.

In some embodiments, the semiconductor structure 100 includes a molding 103. In some embodiments, the molding 103 surrounds the die 101. In some embodiments, the molding 103 is disposed on the surface 102 a of the substrate 102. In some embodiments, the molding 103 is disposed adjacent to the sidewall 101 b of the die 101. In some embodiments, the molding 103 includes epoxy resins, phenolic hardeners, silicas, catalysts or etc. Material for forming the molding has a high thermal conductivity, a low moisture absorption rate, a high flexural strength at board-mounting temperatures, or a combination of these.

In some embodiments, the molding 103 includes a top surface 103 a, a sidewall 103 b and a curved surface 103 c. In some embodiments, the top surface 103 a of the molding 103 is a substantially flat surface parallel to the top surface 101 a of the die 101. In some embodiments, the top surface 103 a of the molding 103 is coupled with the sidewall 103 b of the molding 103 by the curved surface 103 c.

In some embodiments, the top surface 103 a of the molding 103 is at a level substantially higher than the top surface 101 a of the die 101. The top surface 101 a of the die 101 is at a level substantially lower than the top surface 103 a of the molding 103. In some embodiments, there is a level difference H between the top surface 101 a of the die 101 and the top surface 103 a of the molding 103. In some embodiments, the level difference H is about 1.5 um to about 2.5 um. In some embodiments, the level difference H is less than about 2.2 um.

In some embodiments, the sidewall 103 b of the molding 103 is interfaced with the sidewall 101 b of the die 101. In some embodiments, the sidewall 103 b of the molding 103 is attached with the sidewall 101 b of the die 101. In some embodiments, the sidewall 103 b of the molding 103 is substantially orthogonal to the top surface 103 a of the molding 103. In some embodiments, the sidewall 103 b of the molding 103 is a vertical surface and is substantially parallel to the sidewall 101 b of the die 101.

In some embodiments, the curved surface 103 c of the molding 103 has a curvature between the top surface 103 a and the sidewall 103 b of the molding 103. In some embodiments, the curved surface 103 c couples the top surface 103 a with the sidewall 103 b of the molding 103. In some embodiments, the curvature of the curved surface 103 c is greater than zero. In some embodiments, the curvature of the curved surface 103 c is a reciprocal of about 1.5 um to about 2.5 um. In some embodiments, the curvature of the curved surface 103 c is a reciprocal of less than about 2.2 um.

In some embodiments, there is an angle θ of the curved surface 103 c of the molding 103 relative to the top surface 101 a of the die 101. In some embodiments, the angle θ of the curved surface 103 c of the molding 103 is about 20° to about 80°. In some embodiments, the curved surface 103 c of the molding 103 is in a parabolic shape.

In some embodiments, the curved surface 103 c of the molding 103 is a rounded surface for smoothening a change of level between the top surface 101 a of the die 101 and the top surface 103 a of the molding 103. As the curved surface 103 c of the molding 103 mitigates the change of levels between the top surface 101 a of the die 101 and the top surface 103 a of the molding 103, components subsequently disposed over the die 101 and the molding 103 are well attached with the top surface 101 a of the die 101 and the top surface 103 a of the molding 103, and therefore delamination of components is prevented.

In some embodiments, the top surface 103 a of the molding 103 or the curved surface 103 c of the molding 103 has a surface roughness (Ra) of about 0.07 um to about 0.35 um. In some embodiments, the surface roughness (Ra) of the molding 103 is an average of levels within a surface area of about 1 mm² to about 25 mm² of the top surface 103 a or the curved surface 103 c of the molding 103. In some embodiments, the top surface 103 a or the curved surface 103 c of the molding 103 having the surface roughness (Ra) greater than 0.07 um improves a bondability of the top surface 101 a of the die 101 or the top surface 103 a of the molding 103 with components subsequently disposed over the die 101 and the molding 103.

FIG. 2 is a semiconductor structure 200 in accordance with various embodiments of the present disclosure. The semiconductor structure 200 includes a substrate 102. In some embodiments, the substrate 102 has a similar configuration as the substrate 102 of FIG. 1. In some embodiments, the substrate 102 includes a top surface 101 a for receiving a die.

In some embodiments, the semiconductor structure 200 includes a first die 101-1 and a second die 101-2. In some embodiments, the first die 101-1 and the second die 101-2 have similar configuration as the die 101 of FIG. 1 respectively. In some embodiments, the first die 101-1 is a logic die and the second die 101-2 is a dynamic random access memory (DRAM) die. In some embodiments, the first die 101-1 and the second die 101-2 are disposed on the substrate 102 by an adhesive 102 b-1 and 102 b-2 respectively.

In some embodiments, the first die 101-1 includes a first top surface 101 a-1, a first sidewall 101 b-1 and a first bottom surface 101 c-1. In some embodiments, the first bottom surface 101 c-1 is attached with the top surface 102 a of the substrate 102 by the adhesive 102 b-1. In some embodiments, the first sidewall 101 b-1 is substantially orthogonal to the first top surface 101 a-1. In some embodiments, the first die 101-1 includes a die pad 101 d-1 which has similar configuration as the die pad 101 d of FIG. 1.

In some embodiments, the second die 101-2 includes a second top surface 101 a-2, a second sidewall 101 b-2 and a second bottom surface 101 c-2. In some embodiments, the second bottom surface 101 c-2 is attached with the top surface 102 a of the substrate 102 by an adhesive 102 b-2. In some embodiments, the second sidewall 101 b-2 is substantially orthogonal to the second top surface 101 a-2. In some embodiments, the second die 101-2 includes a die pad 101 d-2 which has similar configuration as the die pad 101 d of FIG. 1.

In some embodiments, the first die 101-1 has a height H1 from the first bottom surface 101 c-1 to the first top surface 101 a-1, and the second die 101-2 has a height H2 from the second bottom surface 101 c-2 to the second top surface 101 a-2. In some embodiments, the height H1 is substantially same as the height H2. In some embodiments, the height H1 is greater than the height H2.

In some embodiments, the semiconductor structure 200 includes a molding 103 disposed on the substrate 102 and surrounding the first die 101-1 and the second die 101-2. In some embodiments, the molding 103 has similar configuration as the molding of FIG. 1.

In some embodiments, the molding 103 adjacent to the first die 101-1 includes a first top surface 103 a-1, a first sidewall 103 b-1 and a first curved surface 103 c-1 including a first curvature. In some embodiments, the first top surface 103 a-1, the first sidewall 103 b-1 and the first curved surface 103 c-1 have similar configuration as the top surface 103 a, the sidewall 103 b and the curved surface 103 c of FIG. 1 respectively.

In some embodiments, the first top surface 103 a-1 of the molding 103 is at a level substantially higher than the first top surface 101 a-1 of the first die 101-1. In some embodiments, a level difference H_(mold1) between the first top surface 101 a-1 and the first top surface 103 a-1 is less than about 2.2 um. In some embodiments, an angle θ_(mold1) of the first curved surface 103 c-1 of the molding 103 relative to the first top surface 101 a-1 of the first die 101-1 is about 20° to about 80°.

In some embodiments, the molding 103 adjacent to the second die 101-2 includes a second top surface 103 a-2, a second sidewall 103 b-2 and a second curved surface 103 c-2 including a second curvature. In some embodiments, the second top surface 103 a-2, the second sidewall 103 b-2 and the second curved surface 103 c-2 have similar configuration as the top surface 103 a, the sidewall 103 b and the curved surface 103 c of FIG. 1 respectively. In some embodiments, the second curvature of the second curved surface 103 c-2 is substantially different from the first curvature of the first curved surface 103 c-1. In some embodiments, the second curvature of the second curved surface 103 c-2 is substantially same as the first curvature of the first curved surface 103 c-1.

In some embodiments, the second top surface 103 a-2 of the molding 103 is at a level substantially higher than the second top surface 101 a-2 of the second die 101-2. In some embodiments, a level difference H_(mold2) between the second top surface 101 a-2 and the second top surface 103 a-2 is less than about 2.2 um. In some embodiments, the level difference H_(mold2) is substantially different from the level difference H_(mold1). In some embodiments, the level difference H_(mold2) is substantially same as the level difference H_(mold1).

In some embodiments, an angle θ_(mold2) of the second curved surface 103 c-2 of the molding 103 relative to the second top surface 101 a-2 of the second die 101-2 is about 20° to about 80°. In some embodiments, the angle θ_(mold2) is substantially different from the angle θ_(mold1). In some embodiments, the angle θ_(mold2) is substantially same as the angle θ_(mold1).

In some embodiments, the first die 101-1 and the second die 101-2 are separated by a common portion 103 d of the molding 103. In some embodiments, the common portion 103 d of the molding 103 includes a top surface 103 a, the first curved surface 103 c-1 and the second curved surface 103 c-2. In some embodiments, the top surface 103 a is coupled with the first curved surface 103 c-1 and the second curved surface 103 c-2.

In some embodiments, a level difference H_(moldcommon) between the first top surface 101 a-1 of the first die 101-1 or the second top surface 101 a-2 of the second die 101-2 is less than about 2.2 um. In some embodiments, the level difference H_(moldcommon) is substantially different from the H_(mold1) or H_(mold2). In some embodiments, the level difference H_(moldcommon) is substantially same as the H_(mold1) or H_(mold2).

In some embodiments, an angle θ_(moldcommon) of the first curved surface 103 c-1 of the molding 103 relative to the first top surface 101 a-1 of the first die 101-1 is about 20° to about 80°. In some embodiments, the angle θ_(moldcommon) of the second curved surface 103 c-2 of the molding 103 relative to the second top surface 101 a-2 of the second die 101-2 is about 20° to about 80°. In some embodiments, the angle θ_(moldcommon) is substantially different from the angle θ_(mold1). In some embodiments, the angle θ_(moldcommon) is substantially same as the angle θ_(mold1). In some embodiments, the angle θ_(moldcommon) is substantially different from the angle θ_(mold2). In some embodiments, the angle θ_(moldcommon) is substantially same as the angle θ_(mold2).

FIG. 3 is a semiconductor structure 300 in accordance with various embodiments of the present disclosure. The semiconductor structure 300 includes a die 101 which is in a similar configuration as the die 101 of FIG. 1. In some embodiments, the die 101 includes a top surface 101 a, a sidewall 101 b and a bottom surface 101 c. In some embodiments, the top surface 101 a of the die 101 is substantially orthogonal to the sidewall 101 b of the die 101. In some embodiments, the die 101 includes a die pad 101 d exposed from the top surface 101 a of the die 101.

In some embodiments, the semiconductor structure 300 includes a substrate 102 which is in a similar configuration as the substrate 102 of FIG. 1. In some embodiments, the die 101 is disposed on the substrate 102. In some embodiments, the bottom surface 101 c of the die 101 is attached with a top surface 102 a of the substrate 102 by an adhesive 102 b.

In some embodiments, the semiconductor structure 300 includes a molding 103 surrounding the die 101. In some embodiments, the molding 103 includes epoxy resin. In some embodiments, the molding 103 includes a top surface 103 a and a sidewall 103 b. In some embodiments, the top surface 103 a of the molding 103 is at a level substantially same as the top surface 101 a of the die 101. In some embodiments, the top surface 103 a of the molding 103 is substantially parallel to the top surface 101 a of the die 101.

In some embodiments, the top surface 103 a of the molding 103 is coupled with the sidewall 103 b of the molding 103. In some embodiment, the top surface 103 a of the molding 103 is substantially orthogonal to the sidewall 103 b of the molding 103. In some embodiments, the top surface 103 a of the molding 103 is coupled with the sidewall 101 b of the die 101. In some embodiments, the top surface 103 a of the molding 103 is substantially orthogonal to the sidewall 101 b of the die 101.

FIG. 4 is a semiconductor structure 400 in accordance with various embodiments of the present disclosure. The semiconductor structure 400 includes a substrate 102. In some embodiments, the substrate 102 has a similar configuration as the substrate 102 of FIG. 3. In some embodiments, the substrate 102 includes a top surface 101 a for receiving a die.

In some embodiments, the semiconductor structure 400 includes a first die 101-1 and a second die 101-2. In some embodiments, the first die 101-1 and the second die 101-2 have similar configuration as the die 101 of FIG. 3 respectively. In some embodiments, the first die 101-1 is a logic die and the second die 101-2 is a dynamic random access memory (DRAM) die. In some embodiments, the first die 101-1 and the second die 101-2 are disposed on the substrate 102 by an adhesive 102 b-1 and 102 b-2 respectively.

In some embodiments, the first die 101-1 includes a first top surface 101 a-1, a first sidewall 101 b-1 and a first bottom surface 101 c-1. In some embodiments, the first bottom surface 101 c-1 is attached with the top surface 102 a of the substrate 102 by the adhesive 102 b-1. In some embodiments, the first sidewall 101 b-1 is substantially orthogonal to the first top surface 101 a-1. In some embodiments, the first die 101-1 includes a die pad 101 d-1 which has similar configuration as the die pad 101 d of FIG. 3.

In some embodiments, the second die 101-2 includes a second top surface 101 a-2, a second sidewall 101 b-2 and a second bottom surface 101 c-2. In some embodiments, the second bottom surface 101 c-2 is attached with the top surface 102 a of the substrate 102 by an adhesive 102 b-2. In some embodiments, the second sidewall 101 b-2 is substantially orthogonal to the second top surface 101 a-2. In some embodiments, the second die 101-2 includes a die pad 101 d-2 which has similar configuration as the die pad 101 d of FIG. 1.

In some embodiments, the first die 101-1 has a height H1 from the first bottom surface 101 c-1 to the first top surface 101 a-1, and the second die 101-2 has a height H2 from the second bottom surface 101 c-2 to the second top surface 101 a-2. In some embodiments, the height H1 is substantially same as the height H2. In some embodiments, the height H1 is greater than the height H2.

In some embodiments, the semiconductor structure 400 includes a molding 103 disposed on the substrate 102 and surrounding the first die 101-1 and the second die 101-2. In some embodiments, the molding 103 has similar configuration as the molding of FIG. 3. In some embodiments, the molding 103 adjacent to the first die 101-1 includes a first top surface 103 a-1 and a first sidewall 103 b-1 which are in similar configuration as the top surface 103 a and the sidewall 103 b of FIG. 3 respectively.

In some embodiments, the first top surface 103 a-1 of the molding 103 is at a level substantially same as the first top surface 101 a-1 of the first die 101-1. In some embodiments, the second top surface 103 a-2 of the molding 103 is at a level substantially same as the second top surface 101 a-2 of the second die 101-2. In some embodiments, the first top surface 103 a-1 of the molding 103, the first top surface 101 a-1 of the first die 101-1, the second top surface 103 a-2 of the molding 103 and the second top surface 101 a-2 of the second die 101-2 are at a substantially same level.

In some embodiments, the first die 101-1 and the second die 101-2 are separated by a common portion 103 d of the molding 103. In some embodiments, the common portion 103 d of the molding 103 includes a top surface 103 a coupled with the first sidewall 103 b-1 and the second sidewall 103 b-2 of the molding 103. In some embodiments, the top surface 103 a is at a level substantially same as the first top surface 103 a-1 and the second top surface 103 a-2. In some embodiments, the first top surface 103 a-1, the first top surface 101 a-1, the top surface 103 a, the second top surface 103 a-2 and the second top surface 101 a-2 are at a substantially same level.

FIG. 5 is a semiconductor structure 500 in accordance with various embodiments of the present disclosure. The semiconductor structure 500 includes a substrate 102. In some embodiments, the substrate 102 has a similar configuration as the substrate 102 of FIG. 2 and FIG. 4. In some embodiments, the substrate 102 includes a top surface 102 a for receiving a die.

In some embodiments, the semiconductor structure 200 includes a first die 101-1 and a second die 101-2. In some embodiments, the first die 101-1 and the second die 101-2 have similar configuration as the first die 101-1 and the second die 101-2 of FIG. 2 or FIG. 4 respectively. In some embodiments, the first die 101-1 is a dynamic random access memory (DRAM) die and the second die 101-2 is a logic die. In some embodiments, the first die 101-1 and the second die 101-2 are disposed on the substrate 102 by an adhesive 102 b-1 and 102 b-2 respectively. In some embodiments, a height H1 of the first die 101-1 from a first bottom surface 101 c-1 to a first top surface 101 a-1 is substantially greater than a height H2 of the second die 101-2 from a second bottom surface 101 c-2 to a second top surface 101 a-2.

In some embodiments, the semiconductor structure 500 includes a molding 103 disposed on the substrate 102 and surrounding the first die 101-1 and the second die 101-2. In some embodiments, the molding 103 includes a first top surface 103 a-1 adjacent to the first die 101-1. In some embodiments, the first top surface 103 a-1 of the molding 103 has similar configuration as the top surface 103 a of FIG. 3. In some embodiments, the first top surface 103 a-1 is at a level substantially same as the first top surface 101 a-1 of the first die 101-1.

In some embodiments, the molding 103 adjacent to the second die 101-2 includes a second top surface 103 a-2, a second sidewall 103 b-2 and a second curved surface 103 c-2 including a second curvature. In some embodiments, the second top surface 103 a-2, the second sidewall 103 b-2 and the second curved surface 103 c-2 have similar configuration as the top surface 103 a, the sidewall 103 b and the curved surface 103 c of FIG. 1 respectively.

In some embodiments, the second top surface 103 a-2 is at a level substantially higher than the second top surface 101 a-2 of the second die 101-2. In some embodiments, a level difference H_(mold2) between the second top surface 101 a-2 and the second top surface 103 a-2 is less than about 2.2 um. In some embodiments, an angle θ_(mold2) of the second curved surface 103 c-2 of the molding 103 relative to the second top surface 101 a-2 of the second die 101-2 is about 20° to about 80°.

In some embodiments, the first die 101-1 and the second die 101-2 are separated by a common portion 103 d of the molding 103. In some embodiments, the common portion 103 d of the molding 103 includes a top surface 103 a and a curved surface 103 c. In some embodiments, the top surface 103 a is coupled with the curved surface 103 c.

In some embodiments, a level difference H_(moldcommon) between the top surface 103 a and the second top surface 101 a-2 of the second die 101-2 is less than about 2.2 um. In some embodiments, the level difference H_(moldcommon) is substantially different from the H_(mold2). In some embodiments, the level difference H_(moldcommon) is substantially same as the H_(mold2).

In some embodiments, an angle θ_(moldcommon) of the curved surface 103 c of the molding 103 relative to the second top surface 101 a-2 of the second die 101-2 is about 20° to about 80°. In some embodiments, the angle θ_(moldcommon) is substantially different from the angle θ_(mold2). In some embodiments, the angle θ_(moldcommon) is substantially same as the angle θ_(mold2).

In some embodiments, the second curvature of the second curved surface 103 c-2 is substantially different from a curvature of the curved surface 103 c. In some embodiments, the second curvature of the second curved surface 103 c-2 is substantially same as the curvature of the curved surface 103 c.

FIG. 6 is a semiconductor structure 600 in accordance with various embodiments of the present disclosure. The semiconductor structure 600 includes a die 101, a substrate 102 and a molding 103 which are in similar configuration as the die 101, the substrate 102 and the molding 103 of FIG. 1 respectively.

In some embodiments, the semiconductor structure 600 further includes a polymer 104 disposed over the molding 103 and the die 101. In some embodiments, the polymer 104 is conformal to a top surface 103 a of the molding 103, a curved surface 103 c of the molding 103 and a top surface 101 a of the die 101. In some embodiments, the polymer 104 includes a polymeric material such as epoxy, polyimide, polybenzoxazole (PBO), and the like.

In some embodiments, the polymer 104 includes a first top surface 104 a, a second top surface 104 b and a curved surface 104 c. In some embodiments, the first top surface 104 a is parallel to the second top surface 104 b. In some embodiments, the first top surface 104 a is at a level substantially higher than the second top surface 104 b. In some embodiments, the first top surface 104 a is coupled with the second top surface 104 b by the curved surface 104 c.

In some embodiments, the curved surface 104 c of the polymer 104 is in a parabolic shape. As the curved surface 103 c of the molding 103 mitigates the change of levels between the top surface 101 a of the die 101 and the top surface 103 a of the molding 103, the polymer 104 disposed over the die 101 and the molding 103 are well attached with the top surface 101 a of the die 101 and the top surface 103 a of the molding 103, and therefore delamination of polymer 104 is prevented. In some embodiments, a level difference H_(polymer) between the first top surface 104 a and the second top surface 104 b of the polymer 104 is substantially smaller than the level difference H between the top surface 101 a of the die 101 and the top surface 103 a of the molding 103.

In some embodiments, the curved surface 104 c has a curvature substantially smaller than the curvature of the curved surface 103 c of the molding 103. In some embodiments, there is an angle α of the curved surface 104 c of the polymer 104 relative to the second top surface 104 b of the polymer 104. In some embodiments the angle α of the curved surface 104 c is substantially smaller than the angle θ of the curved surface 103 c of the molding 103.

In some embodiments, the semiconductor structure 600 includes several vias 105 penetrating through the polymer 104 to the top surface 101 a of the die 101. In some embodiments, the vias 105 are configured for electrically connecting a die pad 101 d with a circuitry external to the die 101, so that the die pad 101 d is connected to the external circuitry by a redistribution layer RDL through the vias 105. If there is a large height difference between the vias 105, some vias 105 may not be open. As the curved surface 103 c of the molding 103 mitigates the change of levels between the top surface 101 a of the die 101 and the top surface 103 a of the molding 103, a height difference between vias 105 along the top surface 101 a of the die 101 is reduced, and therefore a failure of opening the vias 105 through the polymer 104 is also reduced.

FIG. 7 is a semiconductor structure 700 in accordance with various embodiments of the present disclosure. The semiconductor structure 700 includes a die 101, a substrate 102 and a molding 103 which are in similar configuration as the die 101, the substrate 102 and the molding 103 of FIG. 3 respectively.

In some embodiments, the semiconductor structure 600 further includes a polymer 104 disposed over the molding 103 and the die 101. In some embodiments, the polymer 104 is conformal to a top surface 103 a of the molding 103 and a top surface 101 a of the die 101. In some embodiments, the polymer 104 includes a polymeric material such as epoxy, polyimide, polybenzoxazole (PBO), and the like.

In some embodiments, the polymer 104 includes a top surface 104 a. In some embodiments, the top surface 104 a is parallel to the top surface 101 a of the die 101. In some embodiments, the top surface 104 a of the polymer 104 is at a constant level along the top surface 103 a of the molding 103 and the top surface 101 a of the die 101. In some embodiments, the semiconductor structure 700 includes a via 105 penetrating through the polymer 104 to the top surface 101 a of the die 101. In some embodiments, the via 105 is configured for electrically connecting a die pad 101 d with a circuitry external to the die 101, so that the die pad 101 d is connected to the external circuitry by a redistribution layer RDL through the via 105.

In the present disclosure, a method of manufacturing a semiconductor structure is also disclosed. In some embodiments, a semiconductor structure is formed by a method 800. The method 800 includes a number of operations and the description and illustration are not deemed as a limitation as the sequence of the operations.

FIG. 8 is a flowchart of a method 800 of manufacturing a semiconductor structure in accordance with various embodiments of the present disclosure. The method 800 includes a number of operations (801, 802, 803, 804, 805, 806, 807, 808, 809, 810 and 811).

In operation 801, a die 101 is received as in FIG. 8A. In some embodiments, the die 101 has similar configuration as the die 101 of FIG. 1. In some embodiments, the die 101 is singulated from a wafer. In some embodiments, the die 101 includes a top surface 101 a, a sidewall 101 b and a bottom surface 101 c. In some embodiments, the die 101 includes a die pad 101 d exposed from the top surface 101 a of the die 101.

In some embodiments, the die 101 includes a sacrificial layer 106 covering the top surface 101 a and the die pad 101 d of the die 101. In some embodiments, the sacrificial layer 106 is configured for protecting the die 101 from damage during a subsequent grinding operation. In some embodiments, the sacrificial layer 106 includes polymer. In some embodiments, the sacrificial layer 106 includes a top surface 106 a.

In operation 802, the die 101 is disposed on a substrate 102 as in FIG. 8B. In some embodiments, the substrate 102 has similar configuration as the substrate 102 of FIG. 1. In some embodiments, the die 101 is attached on the substrate 102 by an adhesive 102 b. In some embodiments, the bottom surface 101 c of the die 101 is attached with a top surface 102 a of the substrate 102 by the adhesive 102 b.

In operation 803, a molding 103 is disposed as in FIG. 8C. In some embodiments, the molding 103 surrounds the die 101 and covers the sacrificial layer 106. In some embodiments, the molding 103 is disposed on the substrate 102 and encapsulates the die 101. In some embodiments, the molding 103 has a top surface 103 a. In some embodiments, the top surface 103 a is parallel to the top surface 101 a of the die 101.

In operation 804, a first portion of the molding 103 and a portion of the sacrificial layer 106 are removed to expose the top surface 106 a of the sacrificial layer 106 as in FIG. 8D. In some embodiments, the first portion of the molding 103 and the portion of the sacrificial layer 106 are removed by a grinding operation for reducing a thickness of the semiconductor structure 800′.

In some embodiments, the first portion of the molding 103 and the portion of the sacrificial layer 106 are ground from the top surface 103 a and the top surface 106 a, such that the top surface 103 a and the top surface 106 a become a new top surface 103 a′ and a new top surface 106 a′ respectively. In some embodiments, the new top surface 103 a′ of the molding 103 is at a level substantially same as the new top surface 106 a′ of the sacrificial layer 106.

In operation 805, a second portion of the molding 103 is removed to expose a sidewall 106 b of the sacrificial layer 106 as in FIG. 8E. In some embodiments, the second portion of the molding 103 is removed by a plasma etching operation. In some embodiments, the plasma etching operation includes connecting the substrate 102 to a grounded or powered electrode and exposing the molding 103 to a plasma including charged ions or neutral atoms. In some embodiments, the plasma chemically reacts with the second portion of the molding 103 to form a volatile etch product, then the volatile etch product is removed from the molding 103, and thus the second portion of the molding 103 is removed upon the chemical reaction between the plasma and the molding 103. In some embodiments, the second portion of the molding 103 is etched away from the new top surface 103 a′ of the molding 103, such that the new top surface 103 a′ becomes another new top surface 103 a″ of the molding 103 and a curved surface 103 c of the molding 103.

In some embodiments, the plasma etching operation includes flowing a gas mixture including carbon tetrafluoride (CF₄), oxygen (O₂) and nitrogen (N₂) towards the molding 103. In some embodiments, CF₄ is flown in a rate of about 200 sccm (standard cubic centimeter per minute), O₂ is flown in a rate of about 400 sccm, and N₂ is flown in a rate of about 800 sccm. In some embodiments, the gas mixture is powered by a source with a power of about 500 Watt. In some embodiments, the plasma etching operation is performed under a temperature of about 60° C. to about 80° C. In some embodiments, the temperature is about 70° C. In some embodiments, the plasma etching operation is performed under a pressure of about 60 Pascal to about 80 Pascal. In some embodiments, the pressure is about 75 Pascal. In some embodiments, the plasma etching operation takes about 15 to about 30 seconds to remove the second portion of the molding 103. In some embodiments, the plasma etching operation takes about 20 seconds to remove the second portion of the molding 103.

In some embodiments, the curved surface 103 c is formed adjacent to a periphery of the top surface 101 a of the die 101. In some embodiments, the new top surface 103 a″ is at a level substantially higher than the top surface 101 a of the die 101. In some embodiments, the new top surface 103 a″ and the curved surface 103 c are in similar configuration as the top surface 103 a and the curved surface 103 c of FIG. 1 respectively.

In some embodiments, the second portion of the molding 103 is removed to reduce a height of the molding 103 from the top surface 101 a of the die 101 to a height H of less than about 2.2 um. In some embodiments, the curved surface 103 c includes a curvature greater than zero after removing the second portion of the molding 103. In some embodiments, an angle θ of the curved surface 103 c of the molding 103 relative to the top surface 101 a of the die 101 is formed after removing the second portion of the molding 103.

In some embodiments, a surface roughness (Ra) of the molding 103 is increased after removing the second portion of the molding 103. In some embodiments, the surface roughness (Ra) of the new top surface 103 a″ or the curved surface 103 c is increased and is greater than 0.07 um.

In operation 806, the sacrificial layer 106 is removed as in FIG. 8F. In some embodiments, the sacrificial layer 106 is removed by a wet etching operation.

In operation 807, a polymer 104 is disposed over the molding 103 as in FIG. 8G. In some embodiments, the polymer 104 includes a first top surface 104 a, a second top surface 104 b and a curved surface 104 c. In some embodiments, the first top surface 104 a is at a level substantially higher than the second top surface 104 b. In some embodiments, the first top surface 104 a is coupled with the second top surface 104 b by the curved surface 104 c.

In some embodiments, a level difference H_(polymer) between the first top surface 104 a and the second top surface 104 b of the polymer 104 is substantially smaller than the level difference H between the top surface 101 a of the die 101 and the new top surface 103 a″ of the molding 103.

In some embodiments, the curved surface 104 c has a curvature substantially smaller than the curvature of the curved surface 103 c of the molding 103. In some embodiments, an angle α of the curved surface 104 c of the polymer 104 relative to the second top surface 104 b of the polymer 104 is substantially smaller than the angle θ of the curved surface 103 c of the molding 103.

In operation 808, a via 105 is formed through the polymer 104 as in FIG. 8H. In some embodiments, the via 105 is formed by photolithography and etching. In some embodiments, the via 105 passes from the second top surface 104 b to the die pad 101 d through the polymer 104.

In operation 809, a redistribution layer (RDL) 107 is formed as in FIG. 8I. In some embodiments, the RDL 107 includes a conductive trace electrically connecting the die pad 101 d through the via 105. In some embodiments, a bond pad 107 a connected to the die pad 101 d through the via 105 is disposed over the polymer 104 for receiving a conductive bump. In some embodiments, the bond pad 107 a is an under bump metallurgy (UBM) pad.

In operation 810, a conductive bump 108 is disposed on the bond pad 107 a as in FIG. 8J. In some embodiments, the conductive bump 108 is configured for attaching on a pad of another substrate. In some embodiments, the conductive bump 108 includes solder.

In operation 811, the semiconductor structure 800′ is bonded with another substrate 109 as in FIG. 8K. In some embodiments, the conductive bump 108 is attached with a pad 109 a of another substrate 109, such that a circuitry of the die 101 is electrically connected with a circuitry of the substrate 109 through the die pad 101 d, the via 105, the RDL 107, the bond pad 107 a, the conductive bump 108 and the pad 109 a. In some embodiments, the semiconductor structure 800′ is bonded with the substrate 109 to form a semiconductor package.

In the present disclosure, a method of manufacturing a semiconductor structure is also disclosed. In some embodiments, a semiconductor structure is formed by a method 900. The method 900 includes a number of operations and the description and illustration are not deemed as a limitation as the sequence of the operations.

FIG. 9 is a flowchart of a method 900 of manufacturing a semiconductor structure in accordance with various embodiments of the present disclosure. The method 600 includes a number of operations (901, 902, 903, 904, 905, 906, 907, 908, 909, 910 and 911).

In operation 901, a first die 101-1 and a second die are received as in FIG. 9A. In some embodiments, the first die 101-1 and the second die 101-2 have similar configuration as the die 101 of FIG. 1 respectively. In some embodiments, the first die 101-1 includes a first die pad 101 d-1 exposed from a first top surface 101 a-1 of the first die 101-1, and the second die 101-2 includes a second die pad 101 d-2 exposed from a second top surface 101 a-2 of the second die 101-2.

In some embodiments, the first die 101-1 has a height H1 and the second die 101-2 has a height H2. In some embodiments, the height H1 is different from the height H2. In some embodiments, the height H1 is smaller than the height H2.

In some embodiments, the first die 101-1 and the second die 101-2 include a first sacrificial layer 106-1 and a second sacrificial layer 106-2 respectively. The first sacrificial layer 106-1 covers the first top surface 101 a-1 and the first die pad 101 d-1, and the second sacrificial layer 106-2 covers the second top surface 101 a-2 and the second die pad 101 d-2. In some embodiments, the first sacrificial layer 106-1 and the second sacrificial layer 106-2 include a first top surface 106 a-1 and a second top surface 106 a-2 respectively.

In operation 902, the first die 101-1 and the second die 101-2 are disposed on a substrate 102 as in FIG. 9B. In some embodiments, the first die 101-1 and the second die 101-2 are attached on the substrate 102 by a first adhesive 102 b-1 and a second adhesive 102 b-2. In some embodiments, the operation 902 is similar to the operation 802 as in FIG. 8B.

In operation 903, a molding 103 is disposed as in FIG. 9C. In some embodiments, the operation 903 is similar to the operation 803 as in FIG. 8C. In some embodiments, the molding 103 encapsulates the first die 101-1 and the second die 101-2. In some embodiments, the molding 103 has a top surface 103 a.

In operation 904, a first portion of molding 103, a portion of the first sacrificial layer 106-1 and a portion of the second sacrificial layer 106-2 are removed to expose a new first top surface 106 a-1′ and a new second top surface 106 a-2′ as in FIG. 9D. In some embodiments, the operation 904 is similar to the operation 803 as in FIG. 8D.

In some embodiments, the first portion of the molding 103, the portion of the first sacrificial layer 106-1 and the portion of the second sacrificial layer 106-2 are ground, such that the top surface 103 a of the molding 103 becomes a new top surface 103 a′, and the first top surface 106 a-1 becomes the new first top surface 106 a-1′, and the second top surface 106 a-2 becomes the new second top surface 106 a-2′. In some embodiments, the new top surface 103 a′ of the molding 103 is at a level substantially same as the new first top surface 106 a-1′ and the second top surface 106 a-2′.

In some embodiments, the removed portion of the first sacrificial layer 106-1 is less than the removed portion of the second sacrificial layer 106-2. In some embodiments, a thickness of the ground first sacrificial layer 106-1 is greater than a thickness of the ground second sacrificial layer 106-2.

In operation 905, a second portion of the molding 103 is removed to expose a first sidewall 106 b-1 of the first sacrificial layer 106-1 and a second sidewall 106 b-2 of the second sacrificial layer 106-2 as in FIG. 9E. In some embodiments, the operation 905 is similar to the operation 805 as in FIG. 8E. In some embodiments, the new top surface 103 a′ of the molding 103 is removed by a plasma etching, such that the new top surface 103 a′ of the molding 103 becomes another new top surface 103 a″ of the molding 103 and a curved surface 103 c of the molding 103. In some embodiments, the plasma etching operation includes connecting the substrate 102 to a grounded or powered electrode and exposing the molding 103 to a plasma including charged ions or neutral atoms. In some embodiments, the plasma chemically reacts with the molding 103 to form a volatile etch product, then the volatile etch product is removed from the molding 103, and thus the second portion of the molding 103 is removed upon the chemical reaction between the plasma and the molding 103.

In some embodiments, the plasma etching operation includes flowing a gas mixture including carbon tetrafluoride (CF₄), oxygen (O₂) and nitrogen (N₂) towards the molding 103. In some embodiments, CF₄ is flown in a rate of about 200 sccm (standard cubic centimeter per minute), O₂ is flown in a rate of about 400 sccm, and N₂ is flown in a rate of about 800 sccm. In some embodiments, the gas mixture is powered by a source with a power of about 500 Watt. In some embodiments, the plasma etching operation is performed under a temperature of about 70° C. In some embodiments, the plasma etching operation is performed under a pressure of about 75 Pascal. In some embodiments, the plasma etching operation takes about 20 seconds to remove the second portion of the molding 103.

In some embodiments, the curved surface 103 c is formed adjacent to a periphery of the first top surface 101 a-1 of the first die 101-1. In some embodiments, the new top surface 103 a″ is at a level substantially higher than the first top surface 101 a-1 of the first die 101-1. In some embodiments, the new top surface 103 a″ is at a level substantially same as the second top surface 101 a-2 of the second die 101-2. In some embodiments, the new top surface 103 a″ is in similar configuration as the first top surface 103 a-1 and the second top surface 103 a-2 of FIG. 5. In some embodiments, the curved surface 103 c is in similar configuration as the curved surface 103 c of FIG. 5.

In some embodiments, the second portion of the molding 103 is removed to reduce a height of the molding 103 from the top surface 101 a of the die 101 to a height H of less than about 2.2 um. In some embodiments, the curved surface 103 c includes a curvature greater than zero after removing the second portion of the molding 103. In some embodiments, an angle θ of the curved surface 103 c of the molding 103 relative to the top surface 101 a of the die 101 is formed after removing the second portion of the molding 103.

In some embodiments, a surface roughness (Ra) of the molding 103 is increased after removing the second portion of the molding 103. In some embodiments, the surface roughness (Ra) of the new top surface 103 a″ or the curved surface 103 c is increased and is greater than 0.07 um.

In operation 906, the first sacrificial layer 106-1 and the second sacrificial layer 106-2 are removed as in FIG. 9F. In some embodiments, the operation 906 is similar to the operation 806 as in FIG. 8F.

In operation 907, a polymer 104 is disposed over the molding 103 as in FIG. 9G. In some embodiments, the operation 907 is similar to the operation 807 as in FIG. 8G. In some embodiments, the polymer 104 includes a first top surface 104 a, a second top surface 104 b and a curved surface 104 c. In some embodiments, the first top surface 104 a is at a level substantially higher than the second top surface 104 b. In some embodiments, the first top surface 104 a is coupled with the second top surface 104 b by the curved surface 104 c.

In some embodiments, there is a level difference H_(polymer) between the first top surface 104 a and the second top surface 104 b of the polymer 104. In some embodiments, the level difference H_(polymer) is disposed above the first die 101-1. In some embodiment, the level difference H_(polymer) is substantially smaller than the level difference H between the first top surface 101 a-1 of the first die 101-1 and the new top surface 103 a″ of the molding 103. In some embodiments, a height of the polymer 104 above the second die 101-2 is constant.

In some embodiments, the curved surface 104 c has a curvature substantially smaller than the curvature of the curved surface 103 c of the molding 103. In some embodiments, an angle α of the curved surface 104 c of the polymer 104 relative to the second top surface 104 b of the polymer 104 is substantially smaller than the angle θ of the curved surface 103 c of the molding 103.

In operation 908, a first via 105-1 and a second via 105-2 are formed through the polymer 104 as in FIG. 9H. In some embodiments, the operation 908 is similar to the operation 808 as in FIG. 8H. In some embodiments, the first via 105-1 passes from the second top surface 104 b to the first die pad 101 d-1 through the polymer 104, and the second via 105-2 passes from the first top surface 104 a to the second die pad 101 d-2 through the polymer 104.

In operation 909, a redistribution layer (RDL) 107-1 and 107-2 is formed as in FIG. 9I. In some embodiments, the operation 909 is similar to the operation 809 as in FIG. 8I. In some embodiments, the RDL 107 includes several conductive traces electrically connecting the first die pad 101 d-1 and the second die pad 101 d-2 with a first bond pad 107 a-1 and a second bond pad 107 a-2 through the first via 105-1 and the second via 105-2 respectively.

In operation 910, several conductive bumps 108 are disposed on the first bond pad 107 a-1 and the second bond pad 107 a-2 as in FIG. 9J. In some embodiments, the operation 910 is similar to the operation 810 as in FIG. 8J.

In operation 911, the semiconductor structure 900′ is bonded with another substrate 109 as in FIG. 9K. In some embodiments, the operation 911 is similar to the operation 811 as in FIG. 8K. In some embodiments, the conductive bump 108 is attached with a pad 109 a disposed on another substrate 109, such that a circuitry of the first die 101-1 and a circuitry of the second die 101-2 are electrically connected with a circuitry of the substrate 109 through the first die pad 101 d-1, the second die pad 101 d-2, the first via 105-1, the second via 105-2, the RDL 107-1 and 107-2, the first bond pad 107 a-1, the second bond pad 107 a-2, the conductive bumps 108 and the pads 109 a. In some embodiments, the semiconductor structure 900′ is bonded with the substrate 109 to form a semiconductor package.

In the present disclosure, a semiconductor structure includes a molding with a curved surface adjacent to a periphery of a die. The curved surface is formed by a plasma etching operation. As a step height of the molding adjacent to the periphery of the die is reduced and the curved surface is formed by the plasma etching operation, a stepping of the molding adjacent to the periphery of the die is mitigated. Therefore, delamination of components is prevented.

In some embodiments, a semiconductor structure includes a die including a top surface and a sidewall, and a molding surrounding the die and including a top surface, a sidewall interfaced with the sidewall of the die, and a curved surface including a curvature greater than zero and coupling the sidewall of the molding with the top surface of the molding.

In some embodiments, the top surface of the die is disposed at a level substantially lower than the top surface of the molding. In some embodiments, the curvature is a reciprocal of about 1.5 um to about 2.5 um. In some embodiments, a level difference between the top surface of the die and the top surface of the molding is less than about 2.2 um. In some embodiments, the curved surface of the molding is in a parabolic shape.

In some embodiments, the top surface of the molding or the curved surface of the molding includes a surface roughness (Ra) of about 0.07 um to about 0.35 um. In some embodiments, the semiconductor structure further includes a polymer disposed over the molding and the die and conformal to the top surface of the molding, the curved surface of the molding and the top surface of the die.

In some embodiments, a semiconductor structure includes a substrate, a die disposed on the substrate and including a top surface and a sidewall, and a molding disposed on the substrate, surrounding the die, and including a top surface and a sidewall interfaced with the sidewall of the die, wherein the top surface of the molding is at a level substantially same as the top surface of the die.

In some embodiments, the top surface of the molding is coupled with the sidewall of the molding and is substantially orthogonal to the sidewall of the molding. In some embodiments, the top surface of the molding is coupled with the sidewall of the die and is substantially orthogonal to the sidewall of the die. In some embodiments, the molding includes epoxy resin.

In some embodiments, a method of manufacturing a semiconductor structure includes providing a die including a top surface, a die pad exposed from the top surface, and a sacrificial layer covering the top surface and the die pad, disposing the die on a substrate, disposing a molding surrounding the die and covering the sacrificial layer, removing a first portion of the molding and a portion of the sacrificial layer to expose a top surface of the sacrificial layer, removing a second portion of the molding to expose a sidewall of the sacrificial layer, and removing the sacrificial layer from the die.

In some embodiments, the removing the second portion of the molding includes a plasma etching operation. In some embodiments, the removing the second portion of the molding includes forming a curved surface of the molding adjacent to a periphery of the top surface of the die and forming a top surface of the molding at a level substantially higher than the top surface of the die. In some embodiments, the removing the second portion of the molding includes forming a top surface of the molding at a level substantially same as the top surface of the die.

In some embodiments, the removing the second portion of the molding includes reducing a height of the molding to less than about 2.2 um from the top surface of the die. In some embodiments, the removing the second portion of the molding includes increasing a surface roughness (Ra) of the molding greater than about 0.07 um. In some embodiments, the removing the first portion of the molding and the portion of the sacrificial layer includes a grinding operation for reducing a thickness of the semiconductor structure. In some embodiments, the removing the sacrificial layer includes a wet etching operation. In some embodiments, the sacrificial layer includes polymer.

The foregoing outlines features of several embodiments so that those skilled in the art may better understand the aspects of the present disclosure. Those skilled in the art should appreciate that they may readily use the present disclosure as a basis for designing or modifying other processes and structures for carrying out the same purposes and/or achieving the same advantages of the embodiments introduced herein. Those skilled in the art should also realize that such equivalent constructions do not depart from the spirit and scope of the present disclosure, and that they may make various changes, substitutions, and alterations herein without departing from the spirit and scope of the present disclosure. 

What is claimed is:
 1. A semiconductor structure, comprising: a first die including a first top surface, a first bottom surface opposite to the first top surface, a first die pad disposed over the first top surface, and a first sidewall; a second die disposed adjacent to the first die, including a second top surface, a second bottom surface opposite to the second top surface, a second die pad disposed over the second top surface, and a second sidewall; and a molding surrounding the first die and the second die and including a third top surface and a curved surface, wherein the molding only interfaces with the first sidewall of the first die and the second sidewall of the second die, the third top surface is disposed at a level substantially same as the first top surface and the first die pad and substantially different from the second top surface and the second die pad, and the curved surface includes a curvature greater than zero and joins the second sidewall of the second die with the third top surface of the molding.
 2. The semiconductor structure of claim 1, wherein the second top surface of the second die is disposed at a level substantially lower than the third top surface of the molding.
 3. The semiconductor structure of claim 1, wherein the curvature is a reciprocal of about 1.5 um to about 2.5 um.
 4. The semiconductor structure of claim 1, wherein a level difference between the second top surface of the second die and the third top surface of the molding is less than about 2.2 um.
 5. The semiconductor structure of claim 1, wherein the curved surface of the molding is in a parabolic shape.
 6. The semiconductor structure of claim 1, wherein the third top surface of the molding or the curved surface of the molding includes a surface roughness (Ra) of about 0.07 um to about 0.35 um.
 7. The semiconductor structure of claim 1, further comprising a polymer disposed over the molding and the die and conformal to the third top surface of the molding, the curved surface of the molding, the first top surface of the first die and the second top surface of the second die.
 8. A semiconductor structure, comprising: a first die including a first top surface, a first die pad disposed over the first top surface and a first sidewall; a second die disposed adjacent to the first die and including a second top surface, a second die pad disposed over the second top surface and a second sidewall; and a molding disposed between the first die and the second die, protruded from the first top surface and the second top surface, and including a third top surface disposed between the first sidewall and the second sidewall, a first curved surface joining the third top surface with the first sidewall and a second curved surface joining the third top surface with the second sidewall, wherein a curvature of the first curved surface is substantially same as a curvature of the second curved surface, and the third top surface of the molding is at a level substantially different from the first top surface of the first die and the second top surface of the second die.
 9. The semiconductor structure of claim 8, wherein the second top surface of the second die is substantially lower than the third top surface of the molding.
 10. The semiconductor structure of claim 8, wherein the second curved surface surrounds the second top surface of the second die.
 11. The semiconductor structure of claim 8, wherein the molding includes epoxy resin.
 12. A semiconductor structure, comprising: a first die including a first top surface, a first die pad disposed over the first top surface and a first sidewall; a second die including a second top surface, a second die pad disposed over the second top surface and a second sidewall; a molding interfacing with the first sidewall and the second sidewall to surround the first die and the second die, and including a third top surface and a curved surface joining the second sidewall of the second die with the third top surface of the molding; and a polymer disposed over the molding, the first die and the second die, wherein a height of the first die is substantially same as a height of the molding, a height of the second die is substantially smaller than the height of the molding and the height of the first die, the first top surface is coplanar with the third top surface, the polymer is interfaced with the first top surface of the first die, the entire third top surface of the molding and the curved surface of the molding, the first top surface is exposed from the molding, and the curved surface surrounds a periphery of the second top surface of the second die and the curved surface has a curvature greater than zero.
 13. The semiconductor structure of claim 1, wherein a sidewall of the molding is interfaced with the first sidewall of the first die and the second sidewall of the second die.
 14. The semiconductor structure of claim 12, wherein the curved surface of the molding is a rounded surface.
 15. The semiconductor structure of claim 1, wherein the curved surface of the molding is coupled with the second sidewall of the second die.
 16. The semiconductor structure of claim 1, wherein a sidewall of the molding is substantially orthogonal to the third top surface of the molding.
 17. The semiconductor structure of claim 12, wherein the first die and the second die are attached on a substrate by an adhesive.
 18. The semiconductor structure of claim 12, wherein the curved surface of the molding is in an angle relative to the second top surface of the second die.
 19. The semiconductor structure of claim 18, wherein the angle is about 20° to about 80°.
 20. The semiconductor structure of claim 7, wherein an angle between a curved surface of the polymer and a fourth top surface of the polymer is substantially smaller than an angle between the curved surface of the molding and the second top surface of the second die. 